Synthesis of 2,4,5-triaryl-1H-imidazoles using a potent, green and reusable nano catalyst (FHS/SiO2)
الموضوعات : Iranian Journal of CatalysisMehdi Bakavoli 1 , Hossein Eshghi 2 , Ali Mohammadi 3 , Hassanali Moradi 4 , Javad Ebrahimi 5
1 - Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, P.O. Box 91775-1436, Mashhad, Iran.
2 - Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, P.O. Box 91775-1436, Mashhad, Iran.
3 - Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, P.O. Box 91775-1436, Mashhad, Iran.
4 - Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, P.O. Box 91775-1436, Mashhad, Iran.
5 - Young Researchers Club, Islamic Azad University, Mashhad Branch
الکلمات المفتاحية: Heterogeneous catalyst, Nano Catalyst, 2, 4, 5-Trisubstituted imidazoles, Solvent-free synthesis, Ferric hydrogen sulfate,
ملخص المقالة :
A simple, green and efficient method for synthesis of 2,4,5-trisubstituted imidazoles is described via three-component cyclocondensation of benzil or benzoin, aldehyde and ammonium acetate by using the nano SiO2-supported ferric hydrogen sulfate (FHS/SiO2), as a catalyst, under solvent-free conditions. The nano SiO2 support and catalyst were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and IR spectroscopy. In this project, the optimum conditions such as: reaction temperature, reaction time and amount of catalyst were investigated. The major advantages of the present method are high yields, shorter reaction times, easy work-up, purification of products by non-chromatographic method and the reusability of the catalyst.
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